arduino Nano Connector Carrier

AI context

Dense context for pasting into a model prompt — addresses, pinout, voltages, tolerances and the vendor's reference circuit.

PART: Arduino Nano Connector Carrier, SKU ASX00061 - a 28 mm x 43 mm carrier that a Nano-family board plugs into, adding Qwiic, Grove and microSD connectivity. It has no microcontroller: two Nano headers (J2, J3) take the host board and the carrier's translators present that board's buses on the outside world. Translators fitted: U1, U2, U3 and U5 are SN74LVC1G125DCKR push-pull buffers, U4 is a TCA9406DCUR open-drain I2C translator. Connectors: J5 and J7 Grove analogue/digital, J4 Grove UART, J8 Qwiic I2C, J9 microSD, S1 the 3.3 V / 5 V board-selector switch.
PINOUT: the vendor numbers the two Nano headers independently and in opposite directions - JP1 (analog side) pads 1-15 run D13 / SCK, +3.3 V, B0 / AREF, A0, A1, A2, A3, A4, A5, A6, A7, +5V, BOOT1, GND, VIN; JP2 (digital side) is printed as pad 15 down to pad 1 running D12 / MISO, D11 / MOSI, D10 / SS, D9, D8, D7, D6, D5, D4 / SD_SS, D3 / *SD_SS, D2 / *SD_SS, GND, RST, D0 / RX, D1 / TX. Because two pads cannot both be number 15, this entry numbers JP1 1-15 and JP2 16-30 in the datasheet's own row order, with the vendor's pad number printed in every description (the Nano R4 convention).
I2C: one bus only, on A4 (SDA) and A5 (SCL), brought out to both the Qwiic JST connector and the Grove I2C connector, plus the Nano headers. There is no I2C device on the carrier itself, so no address is published and addresses is empty.
SUPPLY: the carrier is powered from the host board's nominal voltage - 3.3 V in, or 5.0 V in - selected by the board-selector switch, which the datasheet lists as compatible with Nano ESP32, Arduino Nano, Nano 33 IoT, Nano Every, Nano 33 BLE, Nano 33 BLE Rev2, Nano 33 BLE Sense, Nano 33 BLE Sense Rev2, Nano RP2040 Connect and Nano Matter. Recommended operating temperature -40 to +85 C (25 C typical).
LOGIC AND LEVELS: the switch sets the Grove connectors' VCC pin and the logic level the translators present to the host, so the Grove side follows the host board. The Qwiic connector and the microSD slot are always +3.3 V regardless of the switch position, and the Qwiic connector's logic is fixed at 3.3 V, translated to the host voltage by the on-board translators. Setting the switch to the wrong position for the Nano fitted puts 5 V on a 3.3 V board's Grove connector, or starves a 5 V board's Grove devices.
REFERENCE CIRCUIT: level translation is on the carrier - SN74LVC1G125DCKR push-pull buffers for the analogue/digital and UART paths, TCA9406DCUR open-drain for I2C - so no external shifter is needed between a 5 V Nano and the 3.3 V Qwiic bus. The datasheet publishes no pull-up or decoupling values for the carrier, so none are recorded here.
TRAPS: (1) the microSD slot's SPI slave select defaults to D4; D2 and D3 are alternate selects, selectable with the carrier's solder jumpers, and all three are marked on the header as SD_SS options. (2) The Qwiic connector is 3.3 V even when the switch is on 5 V - only the Grove connectors follow the switch. (3) The carrier needs the host board's voltage to match the switch, and the switch position also sets Grove VCC. (4) The microSD card and the Qwiic connector share the host's I2C/SPI pins with the Nano headers, so the corresponding header pads are occupied.